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"He first tried heroin on his 21st birthday," he said. "He had suffered from depression for many years and smoked strong cannabis. His moods were always up and down and he had made threats to take his own life in the past, but he never actually did anything.

"He had a very high tolerance for drugs - something that would knock someone else off their feet barely touched him."

Dr Catherine Lewis from Victoria Park Medical Centre told the coroner Jonathan had behavioural difficulties since childhood and had been referred to a children's unit in his teens, which was when his drug use began.

"As a result of his drug use, he received a number of custodial sentences, but there were times when he was clean and sober and managed his addiction through heroin substitutes."

Sitting in Taunton , Senior Coroner for Somerset, Tony Williams recorded the cause of death as acute morphine toxicity and a verdict of accidental death.